Re: [PATCH] xhci: Use TRB_CYCLE instead of the constant 0x1

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, Dec 13, 2013 at 11:47:56AM -0800, Sarah Sharp wrote:
> Hi David,
> 
> All right, I'm finally starting to catch up on my patch queue. :)
> Sorry for the delay.
> 
> In general this looks like a good patch, thanks for submitting it.
> However, there's a couple things I need you to fix.

Ah, I just saw your patch v2.  Nevermind.

> 
> On Mon, Nov 04, 2013 at 11:36:00AM -0000, David Laight wrote:
> > In many cases the constant 1 is used for values that eventually
> > get written to the hardware ring. Replace all of these with the
> > symbolic constant TRB_CYCLE.
> > 
> > This makes it clear that the ring->cycle_state value is used when
> > writing to the actual ring itself.
> > 
> > Always use ^= TRB_CYCLE to invert the bit.
> > ---
> 
> The first is that you forgot to include a Signed-off-by line here.
> Running your patch through scripts/checkpatch.pl will help you catch
> these kinds of errors.
> 
> The second is that this patch triggers some checkpatch warnings because
> some of your changes caused the lines to go over 80 characters:
> 
> sarah@xanatos:~/git/kernels/xhci$ git commit -v
> WARNING: line over 80 characters
> #10: FILE: drivers/usb/host/xhci-mem.c:601:
> +			xhci_ring_alloc(xhci, 2, TRB_CYCLE, TYPE_STREAM, mem_flags);
> 
> WARNING: line over 80 characters
> #19: FILE: drivers/usb/host/xhci-mem.c:909:
> +	dev->eps[0].ring = xhci_ring_alloc(xhci, 2, TRB_CYCLE, TYPE_CTRL, flags);
> 
> WARNING: line over 80 characters
> #37: FILE: drivers/usb/host/xhci-mem.c:2304:
> +	xhci->cmd_ring = xhci_ring_alloc(xhci, 1, TRB_CYCLE, TYPE_COMMAND, flags);
> 
> WARNING: line over 80 characters
> #46: FILE: drivers/usb/host/xhci-mem.c:2348:
> +	xhci->event_ring = xhci_ring_alloc(xhci, ERST_NUM_SEGS, TRB_CYCLE, TYPE_EVENT,
> 
> total: 0 errors, 4 warnings, 112 lines checked
> 
> Your patch has style problems, please review.
> 
> Can you please break those lines at 80 characters?
> 
> Thanks,
> Sarah Sharp
> 
> >  drivers/usb/host/xhci-mem.c  | 10 +++++-----
> >  drivers/usb/host/xhci-ring.c | 16 ++++++++--------
> >  drivers/usb/host/xhci.c      |  2 +-
> >  3 files changed, 14 insertions(+), 14 deletions(-)
> > 
> > diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
> > index 9b5d1c3..5b2d835 100644
> > --- a/drivers/usb/host/xhci-mem.c
> > +++ b/drivers/usb/host/xhci-mem.c
> > @@ -597,7 +597,7 @@ struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
> >  	 */
> >  	for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
> >  		stream_info->stream_rings[cur_stream] =
> > -			xhci_ring_alloc(xhci, 2, 1, TYPE_STREAM, mem_flags);
> > +			xhci_ring_alloc(xhci, 2, TRB_CYCLE, TYPE_STREAM, mem_flags);
> >  		cur_ring = stream_info->stream_rings[cur_stream];
> >  		if (!cur_ring)
> >  			goto cleanup_rings;
> > @@ -906,7 +906,7 @@ int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id,
> >  	}
> >  
> >  	/* Allocate endpoint 0 ring */
> > -	dev->eps[0].ring = xhci_ring_alloc(xhci, 2, 1, TYPE_CTRL, flags);
> > +	dev->eps[0].ring = xhci_ring_alloc(xhci, 2, TRB_CYCLE, TYPE_CTRL, flags);
> >  	if (!dev->eps[0].ring)
> >  		goto fail;
> >  
> > @@ -1326,7 +1326,7 @@ int xhci_endpoint_init(struct xhci_hcd *xhci,
> >  	type = usb_endpoint_type(&ep->desc);
> >  	/* Set up the endpoint ring */
> >  	virt_dev->eps[ep_index].new_ring =
> > -		xhci_ring_alloc(xhci, 2, 1, type, mem_flags);
> > +		xhci_ring_alloc(xhci, 2, TRB_CYCLE, type, mem_flags);
> >  	if (!virt_dev->eps[ep_index].new_ring) {
> >  		/* Attempt to use the ring cache */
> >  		if (virt_dev->num_rings_cached == 0)
> > @@ -2311,7 +2311,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
> >  		goto fail;
> >  
> >  	/* Set up the command ring to have one segments for now. */
> > -	xhci->cmd_ring = xhci_ring_alloc(xhci, 1, 1, TYPE_COMMAND, flags);
> > +	xhci->cmd_ring = xhci_ring_alloc(xhci, 1, TRB_CYCLE, TYPE_COMMAND, flags);
> >  	if (!xhci->cmd_ring)
> >  		goto fail;
> >  	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
> > @@ -2355,7 +2355,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
> >  	 * the event ring segment table (ERST).  Section 4.9.3.
> >  	 */
> >  	xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Allocating event ring");
> > -	xhci->event_ring = xhci_ring_alloc(xhci, ERST_NUM_SEGS, 1, TYPE_EVENT,
> > +	xhci->event_ring = xhci_ring_alloc(xhci, ERST_NUM_SEGS, TRB_CYCLE, TYPE_EVENT,
> >  						flags);
> >  	if (!xhci->event_ring)
> >  		goto fail;
> > diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
> > index d3f4a9a..408978b 100644
> > --- a/drivers/usb/host/xhci-ring.c
> > +++ b/drivers/usb/host/xhci-ring.c
> > @@ -178,7 +178,7 @@ static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring)
> >  			if (ring->type == TYPE_EVENT &&
> >  					last_trb_on_last_seg(xhci, ring,
> >  						ring->deq_seg, ring->dequeue)) {
> > -				ring->cycle_state = (ring->cycle_state ? 0 : 1);
> > +				ring->cycle_state ^= TRB_CYCLE;
> >  			}
> >  			ring->deq_seg = ring->deq_seg->next;
> >  			ring->dequeue = ring->deq_seg->trbs;
> > @@ -257,7 +257,7 @@ static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring,
> >  
> >  			/* Toggle the cycle bit after the last ring segment. */
> >  			if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
> > -				ring->cycle_state = (ring->cycle_state ? 0 : 1);
> > +				ring->cycle_state ^= TRB_CYCLE;
> >  			}
> >  		}
> >  		ring->enq_seg = ring->enq_seg->next;
> > @@ -475,7 +475,7 @@ static struct xhci_segment *find_trb_seg(
> >  			&cur_seg->trbs[TRBS_PER_SEGMENT - 1] < trb) {
> >  		generic_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1].generic;
> >  		if (generic_trb->field[3] & cpu_to_le32(LINK_TOGGLE))
> > -			*cycle_state ^= 0x1;
> > +			*cycle_state ^= TRB_CYCLE;
> >  		cur_seg = cur_seg->next;
> >  		if (cur_seg == start_seg)
> >  			/* Looped over the entire list.  Oops! */
> > @@ -2967,7 +2967,7 @@ static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
> >  
> >  			/* Toggle the cycle bit after the last ring segment. */
> >  			if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
> > -				ring->cycle_state = (ring->cycle_state ? 0 : 1);
> > +				ring->cycle_state ^= TRB_CYCLE;
> >  			}
> >  			ring->enq_seg = ring->enq_seg->next;
> >  			ring->enqueue = ring->enq_seg->trbs;
> > @@ -3253,7 +3253,7 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
> >  		if (first_trb) {
> >  			first_trb = false;
> >  			if (start_cycle == 0)
> > -				field |= 0x1;
> > +				field |= TRB_CYCLE;
> >  		} else
> >  			field |= ep_ring->cycle_state;
> >  
> > @@ -3416,7 +3416,7 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
> >  		if (first_trb) {
> >  			first_trb = false;
> >  			if (start_cycle == 0)
> > -				field |= 0x1;
> > +				field |= TRB_CYCLE;
> >  		} else
> >  			field |= ep_ring->cycle_state;
> >  
> > @@ -3531,7 +3531,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
> >  	field = 0;
> >  	field |= TRB_IDT | TRB_TYPE(TRB_SETUP);
> >  	if (start_cycle == 0)
> > -		field |= 0x1;
> > +		field |= TRB_CYCLE;
> >  
> >  	/* xHCI 1.0 6.4.1.2.1: Transfer Type field */
> >  	if (xhci->hci_version == 0x100) {
> > @@ -3741,7 +3741,7 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
> >  				field |= TRB_SIA;
> >  				if (i == 0) {
> >  					if (start_cycle == 0)
> > -						field |= 0x1;
> > +						field |= TRB_CYCLE;
> >  				} else
> >  					field |= ep_ring->cycle_state;
> >  				first_trb = false;
> > diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> > index 0969f74..95729e5 100644
> > --- a/drivers/usb/host/xhci.c
> > +++ b/drivers/usb/host/xhci.c
> > @@ -825,7 +825,7 @@ static void xhci_clear_command_ring(struct xhci_hcd *xhci)
> >  	 * Ring is now zeroed, so the HW should look for change of ownership
> >  	 * when the cycle bit is set to 1.
> >  	 */
> > -	ring->cycle_state = 1;
> > +	ring->cycle_state = TRB_CYCLE;
> >  
> >  	/*
> >  	 * Reset the hardware dequeue pointer.
> > -- 
> > 1.8.1.2
> > 
> > 
> > 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-usb" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux